Mercurial > piecrust2

annotate piecrust/data/base.py @ 432:3aa174a7f3cf

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reporting: Better error messages for incorrect property access on data.
author Ludovic Chabant <ludovic@chabant.com>
date Sat, 27 Jun 2015 21:46:56 -0700
parents 21e26ed867b6
children 5be275137056
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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4b1019bb2533 serve: Giant refactor to change how we handle data when serving pages.
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diff changeset
1 import copy
3
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2 import time
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3 import logging
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4 from piecrust.data.assetor import Assetor
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21e26ed867b6 internal: Create full route metadata in one place.
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5 from piecrust.routing import create_route_metadata
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422052d2e978 internal: Try handling URLs in a consistent way.
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6 from piecrust.uriutil import split_uri
3
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7
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8
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9 logger = logging.getLogger(__name__)
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10
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11
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12 class LazyPageConfigLoaderHasNoValue(Exception):
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13 """ An exception that can be returned when a loader for `LazyPageConfig`
4c9eab0e283b data: Fix problems with using non-existing metadata on a linked page.
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14 can't return any value.
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15 """
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16 pass
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17
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18
3
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19 class LazyPageConfigData(object):
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20 """ An object that represents the configuration header of a page,
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21 but also allows for additional data. It's meant to be exposed
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22 to the templating system.
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23 """
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24 debug_render = []
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25 debug_render_invoke = []
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26 debug_render_dynamic = ['_debugRenderKeys']
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27 debug_render_invoke_dynamic = ['_debugRenderKeys']
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28
3
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29 def __init__(self, page):
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30 self._page = page
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31 self._values = None
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32 self._loaders = None
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33
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34 @property
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35 def page(self):
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36 return self._page
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37
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38 def get(self, name):
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39 try:
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40 return self._getValue(name)
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41 except LazyPageConfigLoaderHasNoValue:
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42 return None
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43
12
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44 def __getattr__(self, name):
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45 try:
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46 return self._getValue(name)
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3aa174a7f3cf reporting: Better error messages for incorrect property access on data.
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47 except LazyPageConfigLoaderHasNoValue as ex:
3aa174a7f3cf reporting: Better error messages for incorrect property access on data.
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48 raise AttributeError("No such attribute: %s" % name) from ex
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49
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50 def __getitem__(self, name):
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51 try:
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52 return self._getValue(name)
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53 except LazyPageConfigLoaderHasNoValue as ex:
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54 raise KeyError("No such key: %s" % name) from ex
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55
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56 def _getValue(self, name):
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57 self._load()
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58
381
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59 if name in self._values:
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60 return self._values[name]
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61
3
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62 if self._loaders:
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63 loader = self._loaders.get(name)
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64 if loader is not None:
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65 try:
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66 self._values[name] = loader(self, name)
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67 except LazyPageConfigLoaderHasNoValue:
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68 raise
3
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69 except Exception as ex:
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70 raise Exception(
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71 "Error while loading attribute '%s' for: %s" %
1187739e5a19 Fix some indentation and line lengths.
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72 (name, self._page.rel_path)) from ex
3
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73
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74 # We need to double-check `_loaders` here because
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75 # the loader could have removed all loaders, which
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76 # would set this back to `None`.
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77 if self._loaders is not None:
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78 del self._loaders[name]
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79 if len(self._loaders) == 0:
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80 self._loaders = None
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81
381
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82 else:
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83 loader = self._loaders.get('*')
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84 if loader is not None:
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85 try:
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86 self._values[name] = loader(self, name)
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87 except LazyPageConfigLoaderHasNoValue:
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88 raise
236
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89 except Exception as ex:
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90 raise Exception(
381
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91 "Error while loading attribute '%s' for: %s" %
236
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92 (name, self._page.rel_path)) from ex
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93 # We always keep the wildcard loader in the loaders list.
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94
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95 if name not in self._values:
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96 raise LazyPageConfigLoaderHasNoValue()
3
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97 return self._values[name]
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98
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99 def _setValue(self, name, value):
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100 if self._values is None:
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101 raise Exception("Can't call _setValue before this data has been "
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102 "loaded")
3
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103 self._values[name] = value
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104
420
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105 def mapLoader(self, attr_name, loader, override_existing=False):
3
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106 if loader is None:
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107 if self._loaders is None or attr_name not in self._loaders:
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108 return
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109 del self._loaders[attr_name]
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110 if len(self._loaders) == 0:
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111 self._loaders = None
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112 return
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113
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114 if self._loaders is None:
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115 self._loaders = {}
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116 if not override_existing and attr_name in self._loaders:
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117 raise Exception(
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118 "A loader has already been mapped for: %s" % attr_name)
3
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119 self._loaders[attr_name] = loader
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120
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121 def mapValue(self, attr_name, value, override_existing=False):
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122 loader = lambda _, __: value
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123 self.mapLoader(attr_name, loader, override_existing=override_existing)
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124
3
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125 def _load(self):
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126 if self._values is not None:
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127 return
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128 self._values = self._page.config.getDeepcopy(self._page.app.debug)
3
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129 try:
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130 self._loadCustom()
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131 except Exception as ex:
158
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132 raise Exception(
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133 "Error while loading data for: %s" %
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134 self._page.rel_path) from ex
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135
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136 def _loadCustom(self):
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137 pass
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138
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139 def _debugRenderKeys(self):
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140 self._load()
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141 keys = set(self._values.keys())
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142 if self._loaders:
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143 keys |= set(self._loaders.keys())
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144 return list(keys)
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145
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146
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147 class PaginationData(LazyPageConfigData):
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148 def __init__(self, page):
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149 super(PaginationData, self).__init__(page)
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150 self._route = None
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151 self._route_metadata = None
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152
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153 def _get_uri(self):
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154 page = self._page
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155 if self._route is None:
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156 # TODO: this is not quite correct, as we're missing parts of the
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157 # route metadata if the current page is a taxonomy page.
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158 route_metadata = create_route_metadata(page)
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159 self._route = page.app.getRoute(page.source.name, route_metadata)
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160 self._route_metadata = route_metadata
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161 if self._route is None:
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162 raise Exception("Can't get route for page: %s" % page.path)
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163 return self._route.getUri(self._route_metadata)
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164
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165 def _loadCustom(self):
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166 page_url = self._get_uri()
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167 _, slug = split_uri(self.page.app, page_url)
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168 self._setValue('url', page_url)
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169 self._setValue('slug', slug)
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170 self._setValue(
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171 'timestamp',
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172 time.mktime(self.page.datetime.timetuple()))
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173 date_format = self.page.app.config.get('site/date_format')
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174 if date_format:
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175 self._setValue('date', self.page.datetime.strftime(date_format))
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176
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177 assetor = Assetor(self.page, page_url)
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178 self._setValue('assets', assetor)
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179
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180 segment_names = self.page.config.get('segments')
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181 for name in segment_names:
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182 self.mapLoader(name, self._load_rendered_segment)
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183
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184 def _load_rendered_segment(self, data, name):
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185 do_render = True
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186 eis = self._page.app.env.exec_info_stack
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187 if eis is not None and eis.hasPage(self._page):
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188 # This is the pagination data for the page that is currently
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189 # being rendered! Inception! But this is possible... so just
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190 # prevent infinite recursion.
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191 do_render = False
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192
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193 assert self is data
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194
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195 if do_render:
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196 uri = self._get_uri()
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197 try:
158
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198 from piecrust.rendering import (
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199 QualifiedPage, PageRenderingContext,
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200 render_page_segments)
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201 qp = QualifiedPage(self._page, self._route,
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202 self._route_metadata)
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203 ctx = PageRenderingContext(qp)
415
0e9a94b7fdfa bake: Improve bake record information.
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diff changeset
204 render_result = render_page_segments(ctx)
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205 segs = render_result.segments
12
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206 except Exception as e:
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207 raise Exception(
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208 "Error rendering segments for '%s'" % uri) from e
12
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209 else:
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210 segs = {}
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211 for name in self.page.config.get('segments'):
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212 segs[name] = "<unavailable: current page>"
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213
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214 for k, v in segs.items():
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215 self.mapLoader(k, None)
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216 self._setValue(k, v)
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217
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218 if 'content.abstract' in segs:
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219 self._setValue('content', segs['content.abstract'])
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220 self._setValue('has_more', True)
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221 if name == 'content':
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222 return segs['content.abstract']
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diff changeset
223
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224 return segs[name]
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diff changeset
225